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You are here: Home / Juniper / QFX5100 FAN may report intermittent cosmetic alarm

QFX5100 FAN may report intermittent cosmetic alarm

June 3, 2016 by James Palmer

QFX5100 FAN may incorrectly report failure by Junos because the unit spins at RPM that outside the threshold defines in Junos. These fans are not failing and there is no need to replace them.
In Junos CLI, QFX5100 FAN may report failure while the fan is spinning at certain RPM.

root> show chassis environment 
Class Item                           Status     Measurement
...
Fans  FPC 0 Fan Tray 0               Failed    
...


root> show chassis fan 
      Item                      Status   RPM     Measurement
      FPC 0 Tray 0 Fan 0        OK       10305   Failure                  
      FPC 0 Tray 0 Fan 1        OK       9642    Failure      
...

Fans are spinning at RPM which is outside the tolerated threshold defined by Junos.

The new Junos will extend the tolerance for allowed RPM from +-20% to +30%/-20%

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Filed Under: Juniper

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